Mount Mahameru Eruption in the Southeast Asian nation Prompts Evacuations

The nation's Semeru volcano, the tallest summit on the island of Java, has erupted, blanketing several villages with volcanic ash, leading to evacuations and leading authorities to raise the alert to the maximum level.

The volcano in the province of East Java unleashed blistering plumes of fiery ash and a combination of stone, molten rock, and gases that travelled up to 7km down its sides several times from midday to dusk, while a dense plume of fiery clouds rose 2km into the air, according to the nation's geological authority.

The outbursts that occurred throughout the day compelled authorities to raise the volcano’s alert level twice, from the level three to the top level, the authority said. No casualties have been reported.

Over three hundred inhabitants in the three communities most at risk in the district of Lumajang region were relocated to government shelters, according to a spokesperson for the national emergency management body.

He said that heightened volcanic movements of the volcano on the afternoon of Wednesday led authorities to expand the hazard area to 8km from the crater. Residents were advised to stay clear from an zone along the Kobokan River, which is the route of the lava flow, as searing gas moved down Semeru’s slopes.

Videos on online platforms displayed a dense cloud of ash moving through a forested valley to a waterway beneath a bridge. Locals, some with faces smeared with volcanic dust and water, fled to temporary shelters or left for other safe areas.

Local media indicated that authorities were facing challenges to rescue about 178 people trapped on the 3,676-metre mountain at the Ranu Kumbolo monitoring post. The party comprised 137 hikers, 15 carriers, seven escorts and six tourism officials, according to an spokesperson with the national park.

“They are currently safe at the Ranu Kumbolo station,” an official stated in a video statement. He said the station was located 2.8 miles from the crater on the north side of the volcano, which is not in the path of the hot cloud flow that was seen traveling to the southeast direction. Inclement conditions and rain forced the team to remain overnight there, he added.

Semeru, also known as Great Mountain, has erupted many occasions in the last two centuries. Still, as is the case with many of the 129 active volcanoes in the archipelago, thousands of people continue to reside on its fertile slopes.

The mountain's previous significant explosion was in December 2021, when 51 individuals were killed and several hundred more were injured and villages were buried in thick mud. The eruption led to the evacuation of over ten thousand residents from their homes.

The country, an island chain of over 280 million inhabitants, sits along the Pacific “ring of fire”, a curved series of fault lines, and is prone to earthquakes and volcanic activity.